This JavaScript exception missing variable name occurs frequently If the name is missing or the comma is wrongly placed. There may be a typing mistake.

Message:

SyntaxError: missing variable name (Firefox)
SyntaxError: Unexpected token = (Chrome)

Error Type:

SyntaxError

Cause of Error: There might be a variable missing a name. This is because of syntax errors in the code. The comma might be misplaced somewhere in the code.

Case 1: Missing Variable Name in Declaration

Error Cause:

A common cause is declaring a variable without providing a name.

Example:

let = "value";

Output:

SyntaxError: Missing variable name

Resolution of Error:

Provide a name for the variable.

let example = "value"; // Correct usage
console.log(example);

value

Case 2: Using Reserved Keywords as Variable Names

Error Cause:

Using reserved keywords or invalid characters as variable names can also cause this error.

Example:

let var = "value";

Output:

SyntaxError: Unexpected token 'var'

Resolution of Error:

Use valid and non-reserved identifiers as variable names.

let exampleVar = "value"; // Correct usage
console.log(exampleVar);

value

Case 3: Incomplete Variable Declaration

Error Cause:

Another cause is an incomplete variable declaration, such as when the variable name is missing after the declaration keyword.

Example:

const;

Output:

SyntaxError: Missing variable name

Resolution of Error:

Complete the variable declaration with a valid variable name and value.

const exampleConst = "value"; // Correct usage
console.log(exampleConst);

value